What happens if the study shows yes, that their no was wrong. Or does
that never happen?😕
On 12/26/2022 12:48 PM, Jay via RE-wrenches wrote:
If the utility is PG&E in my experience here is what happens
They say yes or no to the interconnection.
If no you have the option to request an engineering study to determine
how much solar. That study is at your expense, paid in advance and the
exact cost isn’t known until the study is done. Could be $500 to
$15,000 or more.
I’ll be curious to know what happens
Jay
On Dec 26, 2022, at 9:07 AM, Drake Chamberlin via RE-wrenches
<re-wrenches@lists.re-wrenches.org> wrote:

William,
I ran into this once on an old transformer, which fortunately they
changed at no cost. It was a 10 kW transformer on a 200 A (48 kW)
service. They had some dimming of lights on heavy loads, and the
transformer was changed out on that basis, at no charge.
My questions for the utility would be?
* Are there any other PV systems feeding the transformer?
o If so, what is their maximum production.
* What size is the transformer?
* What percentage of transformer capacity is allowed to be back-fed.
If the math comes out in your favor, you will have a good case to
escalate to the next level.
Good Luck,
Drake
Drake Chamberlin
Athens Electric LLC
Ohio Electrical Contractor’s License 44810
CO Master Electrician’s License 4526
NABCEP Certified PV Installation Professional
-------------------------------------------------------------------------------
On 2022-12-25 13:58, William Miller via RE-wrenches wrote:
Wrenched:
Merry Christmas to those of you that observe such traditions, or
substitute the winter festivity of your choice.
I helped a previous employee install an Enphase IQ8 system on his
home. He applied for the utility approval concurrently with his
building permit The day he got his final inspection the utility
contacted him and claimed "The aggregate generation exceeds the
identified transformer rating" and refused him a Permission to
Operate letter.
Adding up the service ratings of the homes on his secondary we get
about 336 kW of potential consumption. Adding the grid-tied systems
on his secondary we get about 16.5 kW. How is it that the back-feed
exceeds the transformer rating?
I would appreciate any insight on how to consider this situation and
how to fight it.
Sincerely,
William Miller
Miller Solar
17395 Oak Road, Atascadero, CA 93422
805-438-5600
www.millersolar.com <http://www.millersolar.com/>
CA Lic. 773985
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